File: greater_than.go

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// Copyright 2011 Aaron Jacobs. All Rights Reserved.
// Author: aaronjjacobs@gmail.com (Aaron Jacobs)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package oglematchers

import (
	"fmt"
	"reflect"
)

// GreaterThan returns a matcher that matches integer, floating point, or
// strings values v such that v > x. Comparison is not defined between numeric
// and string types, but is defined between all integer and floating point
// types.
//
// x must itself be an integer, floating point, or string type; otherwise,
// GreaterThan will panic.
func GreaterThan(x interface{}) Matcher {
	desc := fmt.Sprintf("greater than %v", x)

	// Special case: make it clear that strings are strings.
	if reflect.TypeOf(x).Kind() == reflect.String {
		desc = fmt.Sprintf("greater than \"%s\"", x)
	}

	return transformDescription(Not(LessOrEqual(x)), desc)
}